Take your time.

慢慢来

No rush/hurry.

不着急

Don't rush into it. /Don't rush into anything.

别草率行事

There's no reason/need to hurry/rush. 

没必要着急

Don't be in such a hurry/rush. 

别这么着急

Don't be so impatient.

别这么没耐心

We have plenty of time. 

我们有足够的时间。

Take it easy. 

放轻松

Calm down.

冷静点

Relax.

放松

No need to rush yourself. 

没必要让自己太着急

What's the rush/hurry/emergency?

什么事情这么匆忙？/着急？/紧急？

Why are you in such a rush/hurry?

你为什么这么着急？

Why the big hurry?

为什么这么急？

Dialogue1:

A: Don't worry, take your time.

别着急，慢慢来。

B: I'm glad we left early, so we wouldn't have to rush. 

很高兴我们早早就出门了，这样就不必着急了。

Dialogue2:

A: Calm down. What's the rush?

冷静点儿，有什么好着急的？

B: Sorry, I'm just excited. 

对不起，我只是太兴奋了。

Dialogue3:

A: Take your time deciding. Don't rush into anything. 

等等再做决定，别着急。

B: Thanks. I'll be sure and consider everything you mentioned. 

谢谢，我一定会考虑你的话。

Dialogue4:

A: Slow down, patience is virtue.

慢点儿，忍耐是一种美德。

B: Yeah, well, silence is golden. Be quiet. 

知道了，沉默是金，安静点儿。

Dialogue5:

A: I'll be done soon.

我一会儿就好了。

B: No hurry. Just let me know when you are finished. 

不着急，你结束了告诉我就行。